US6459011B1ExpiredUtility

Directed pollutant oxidation using simultaneous catalytic metal chelation and organic pollutant complexation

73
Assignee: UNIV NEW ORLEANS RES AND TECHNPriority: Jun 18, 1999Filed: Jun 19, 2000Granted: Oct 1, 2002
Est. expiryJun 18, 2019(expired)· nominal 20-yr term from priority
Inventors:Matthew A. TarrMichele E. Lindsey
A62D 2101/47A62D 3/38A62D 3/33A62D 2101/22A62D 2101/28A62D 2101/20
73
PatentIndex Score
41
Cited by
7
References
40
Claims

Abstract

A method of oxidizing organic pollutants in a solution comprises chelating a catalytic metal with cyclodextrins (CD) and/or derivatized cyclodextrins (dCD), and simultaneously complexing an organic pollutant with cyclodextrins (CD) and/or derivatized cyclodextrins (dCD). The CD or dCD is capable of removing the pollutant from sorption sites (either in solution, in soil/sediment, or on surfaces). Furthermore, the CD/dCD is also capable of competing with other metal chelators that may be present in the system. The ability of the CD/dCD to bind both the pollutant and the metal in the presence of competing binding sites is essential for the success of the technique.

Claims

exact text as granted — not AI-modified
What is claimed is:  
     
       1. A method of oxidizing organic pollutants in a sample comprising a solution, suspension, slurry, soil, or solid comprising: 
       chelating a catalytic metal in said sample with cyclodextrins (CD) and/or derivatized cyclodextrins (dCD);  
       simultaneously complexing an organic pollutant in said sample with cyclodextrins (CD) and/or derivatized cyclodextrins (dCD).  
     
     
       2. The method of  claim 1 , further comprising adding hydrogen peroxide, sodium peroxide, calcium peroxide, or mixtures thereof to the solution, suspension, slurry, soil, or solid. 
     
     
       3. The method of  claim 1 , wherein the organic pollutant is a hydrophobic organic compound which is in the presence of other non-pollutant chemicals which would otherwise interfere with pollutant degradation. 
     
     
       4. The method of  claim 1 , wherein the catalytic metal is iron(II). 
     
     
       5. The method of  claim 1 , wherein the cyclodextrins include α-CD. 
     
     
       6. The method of  claim 1 , wherein the cyclodextrins include β-CD. 
     
     
       7. The method of  claim 1 , wherein the cyclodextrins include γ-CD. 
     
     
       8. The method of  claim 1 , wherein the derivatized cyclodextrins include carboxymethyl cyclodextrin. 
     
     
       9. The method of  claim 1 , wherein the derivatized cyclodextrins include carboxypropyl cyclodextrin. 
     
     
       10. The method of  claim 1 , wherein the organic pollutant is selected from the group consisting of petroleum compounds, agricultural chemicals, dioxins, polychlorinated biphenyls (PCBs), polycyclic aromatic hydrocarbons (PAHs), textile dyes, and other hydrophobic organic compounds. 
     
     
       11. The method of  claim 1 , further comprising using other chemical or biological degradation technologies. 
     
     
       12. The method of  claim 1 , wherein the sample is an aqueous solution. 
     
     
       13. The method of  claim 1 , wherein the sample is a chemical waste stream. 
     
     
       14. The method of  claim 1 , wherein the sample is a slurry. 
     
     
       15. The method of  claim 1 , wherein the sample is a solid. 
     
     
       16. The method of  claim 1 , wherein the derivatized cyclodextrins include α-dCD, β-dCD, and/or γ-dCD. 
     
     
       17. The method of  claim 1 , wherein the sample is soil, sand, sediment, groundwater, or any subsurface region. 
     
     
       18. The method of  claim 1 , wherein the catalytic metal, cyclodextrins (CD) and/or derivatized cyclodextrins (dCD) are injected subsurface. 
     
     
       19. The method of  claim 1 , wherein PCBs, or other organic pollutants, sorbed to a surface are degraded. 
     
     
       20. The method of  claim 19 , wherein the surface is glass. 
     
     
       21. The method of  claim 19 , wherein the surface is metal. 
     
     
       22. The method of  claim 19 , wherein the surface is a polymer or composite. 
     
     
       23. The method of  claim 19 , wherein the surface includes significant amounts of grime. 
     
     
       24. The method of  claim 19 , comprising decontaminating organic chemical warfare agents from vehicles. 
     
     
       25. The method of  claim 1 , wherein the cyclodextrins (CD) and/or derivatized cyclodextrins (dCD) bind both the organic pollutant and the catalytic metal in the presence of competing binding sites. 
     
     
       26. The method of  claim 1 , wherein the pH of the sample is adjusted to provide an acidic solution (pH<6). 
     
     
       27. The method of  claim 1 , wherein the catalytic metal is added to the sample. 
     
     
       28. The method of  claim 1 , wherein the cyclodextrins (CD) and/or derivatized cyclodextrins (dCD) are added to the sample in an initial concentration of about 1-10 millimoles of CD and/or dCD per liter of total sample volume, including all other added reagents. 
     
     
       29. The method of  claim 1 , wherein the catalytic metal is added to the sample in an initial concentration of about 10-1000 millimoles of catalytic metal per liter of aqueous solution added to the sample. 
     
     
       30. The method of  claim 1 , wherein the catalytic metal is added to the sample to provide an initial concentration of about 10-100 millimoles of catalytic metal per liter of total sample volume, including all other added reagents. 
     
     
       31. The method of  claim 1 , wherein hydrogen peroxide, sodium peroxide, calcium peroxide, or mixtures thereof are added to the solution, suspension, slurry, soil, or solid in an initial concentration of about 0.1-1 millimoles of hydrogen peroxide, sodium peroxide, calcium peroxide, or mixtures thereof per liter of sample, including all other added reagents. 
     
     
       32. The method of  claim 1 , wherein the cyclodextrins (CD) and/or derivatized cyclodextrins (dCD) are added to the sample in an initial concentration of about 0.1-50,000 moles of CD and/or dCD per mole pollutant. 
     
     
       33. The method of  claim 1 , wherein the cyclodextrins (CD) and/or derivatized cyclodextrins (dCD) are added to the sample in an initial concentration of about 1-10,000 moles of CD and/or dCD per mole pollutant. 
     
     
       34. The method of  claim 1 , wherein the cyclodextrins (CD) and/or derivatized cyclodextrins (dCD) are added to the sample in an initial concentration of about 5-5000 moles of CD and/or dCD per mole pollutant. 
     
     
       35. The method of  claim 1 , wherein iron is added to the sample in an initial concentration of about 0.1-100 moles Fe per mole CD and/or dCD. 
     
     
       36. The method of  claim 1 , wherein iron is added to the sample in an initial concentration of about 0.5-50 moles Fe per mole CD and/or dCD. 
     
     
       37. The method of  claim 1 , wherein iron is added to the sample in an initial concentration of about 1-10 moles Fe per mole CD and/or dCD. 
     
     
       38. The method of  claim 1 , wherein hydrogen peroxide, sodium peroxide, calcium peroxide, or mixtures thereof is added to the sample in an initial concentration of about 0.1-500 moles peroxide/mole iron. 
     
     
       39. The method of  claim 1 , wherein hydrogen peroxide, sodium peroxide, calcium peroxide, or mixtures thereof is added to the sample in an initial concentration of about 1-100 moles peroxide/mole iron. 
     
     
       40. The method of  claim 1 , wherein hydrogen peroxide, sodium peroxide, calcium peroxide, or mixtures thereof is added to the sample in an initial concentration of about 5-20 moles peroxide/mole iron.

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